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I think you guys need to first decide exactly what you mean by "fast player", then it should be easy to design the formula.
For example: To me, a fast player is a player who responds soon after I move. When I log on, it is usually my move in that game, and sometimes we are both online and we can make several moves in a row. If that's what you mean by "fast player" then just measure the average time between opponent's move and player's move in each game.
(kaŝi) Se vi bezonas malnovan mesaĝon de elektita uzanto, klaku ties karakteristikon kaj uzu la ligilon "montri mesaĝojn de ĉitiu uzanto" supre en la paĝo. (konec) (Montri ĉiujn konsilojn)